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Polyploidy in non-neoplastic tissues
S Biesterfeld1, K Gerres, G Fischer-Wein
1Institute of Pathology, University of Technology, Aachen, Germany.
Aim:
To investigate the prevalence and amount of polyploidy in fine needle aspiration specimens of the liver, urinary cytospin preparations, and cytospin preparations from pleural and peritoneal fluid.
Methods:
Cells from 44 liver smears, 48 urine specimens, and 46 pleural and peritoneal aspirations were examined. After Feulgen restaining the DNA content of 100 randomly selected nuclei was determined using a TAS-plus image analysis system, combined with an automated microscope.
Results:
Polyploidy was observed up to 16c in the liver, and up to 8c in urothelium and mesothelium. Sixty eight per cent of the liver aspirates contained polyploid nuclei. The rate in urothelium was 20.8% and in mesothelium 6.5%.
Conclusions:
Polyploidy in the liver may be interpreted as being associated with tissue differentiation, but the findings in urothelium and mesothelium remain of unknown importance.
Insights
Polyploidy, an increase in chromosome sets, is common in liver aspirates and can reach 16c. Its significance in urothelium and mesothelium remains unclear.
Area of Science:
- Cytopathology
- Genetics
- Cell Biology
Background:
- Polyploidy, the presence of more than two sets of chromosomes, is a known phenomenon in various cell types.
- Understanding polyploidy in different tissues is crucial for interpreting cellular abnormalities.
Purpose of the Study:
- To determine the prevalence and extent of polyploidy in liver, urine, and serous fluid cytology specimens.
- To investigate potential associations between polyploidy and tissue differentiation.
Main Methods:
- Analysis of fine needle aspiration (FNA) specimens from liver, urine, and pleural/peritoneal fluids.
- Feulgen restaining and DNA content measurement of 100 nuclei per sample using automated image analysis (TAS-plus system).
Main Results:
- Polyploidy was detected up to 16c in liver cells and up to 8c in urothelial and mesothelial cells.
- Sixty-eight percent of liver aspirates showed polyploid nuclei, compared to 20.8% in urothelium and 6.5% in mesothelium.
Conclusions:
- Liver polyploidy may correlate with tissue differentiation.
- The functional significance of polyploidy in urothelium and mesothelium requires further investigation.